US6791741B2ExpiredUtilityPatentIndex 93
Optical apparatus
Est. expiryJul 13, 2021(expired)· nominal 20-yr term from priority
Inventors:NISHIOKA KIMIHIKO
G02B 3/14G02B 26/0825
93
PatentIndex Score
23
Cited by
3
References
25
Claims
Abstract
An optical system having a deformable mirror is such that, in order to minimize variation of an image position on an imaging plane, or of a ray position, in at least two states where shapes of the deformable mirror are different, first- and lower-order terms of an equation expressing a surface of the deformable mirror are changed in the two states. As a result, an optical system including variable optical-property elements such as a variable focal-length lens, a deformable mirror, and a variable prism, and an optical apparatus having the optical system can be provided which is small in power consumption, noiseless, short in response time, simple in mechanical structure, and low in cost, minimize variation of the image position on the imaging plane, and permits sufficient correction for aberration caused by a shape error or the like.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1. An optical system comprising a deformable mirror, the deformable mirror comprising:
a variable member that is deformable to take at least two different shapes; and
a control system that controls the variable member,
wherein the at least two different shapes are achieved by a change of at least one of zeroth-order and first-order terms of an equation expressing a surface of the deformable mirror.
2. An optical system according to claim 1 , used in a shake compensating optical system.
3. An optical system according to claim 2 , wherein the optical system satisfies any one of the following conditions:
| S |<({fraction (1/30)})| f|
| S |<(⅕)| f|
| S |<({fraction (1/50)})| f|
where S is an amount of shift of a ray position or an amount of shift of an image position on an imaging plane between two states where the deformable mirror takes the two different shapes, and f is an average focal length.
4. An optical apparatus comprising:
the optical system according to claim 2 ,
an image sensor; and
a display device.
5. An optical apparatus according to claim 4 , wherein the optical system satisfies any one of the following conditions:
| S |<({fraction (1/30)})| f|
| S |<(⅕)| f|
| S |<({fraction (1/50)})| f|
where S is an amount of shift of a ray position or an amount of shift of an image position on an imaging plane between two states where the deformable mirror takes the two different shapes, and f is an average focal length.
6. An optical apparatus comprising:
the optical system according to claim 2 ; and
a shake compensating sensor.
7. An optical system according to claim 1 , wherein the optical system satisfies any one of the following conditions:
| S |<({fraction (1/30)})| f|
| S |<(⅕)| f|
| S |<({fraction (1/50)})| f|
where S is an amount of shift of a ray position or an amount of shift of an image position on an imaging plane between two states where the deformable mirror takes the two different shapes, and f is an average focal length.
8. An optical apparatus comprising:
the optical system according to claim 1 ;
an image sensor; and
a display device.
9. An optical apparatus according to claim 8 , wherein the optical system satisfies any one of the following conditions:
| S |<({fraction (1/30)})| f|
| S |<(⅕)| f|
| S |<({fraction (1/50)})| f|
where S is an amount of shift of a ray position or an amount of shift of an image position on an imaging plane between two states where the deformable mirror takes the two different shapes, and f is an average focal length.
10. An optical system comprising a plurality of deformable mirrors, each of the plurality of deformable mirrors comprising:
a variable member that is deformable to take at least two different shapes; and
a control system that controls the variable member,
wherein the at least two different shapes are achieved by a change of at least one of zeroth-order and first-order terms of an equation expressing a surface of the deformable mirror.
11. A variable magnification optical system comprising the optical system according to claim 10 .
12. A variable magnification optical system according to claim 11 , wherein the variable magnification optical system satisfies any one of the following conditions:
|S|< ({fraction (1/30)})| f|
|S|< (⅕)| f|
|S|< ({fraction (1/50)})| f|
where S is an amount of shift of a ray position or an amount of shift of an image position on an imaging plane between two states where each of the deformable mirrors takes the different shapes, and f is an average focal length.
13. An optical apparatus comprising:
the variable magnification optical system according to claim 11 ;
an image sensor; and
a display device.
14. An optical apparatus according to claim 13 , wherein the optical system satisfies any one of the following conditions:
| S |<({fraction (1/30)})| f|
| S |<(⅕)| f|
| S |<({fraction (1/50)})| f|
where S is an amount of shift of a ray position or an amount of shift of an image position on an imaging plane between two states where each of the deformable mirrors takes the two different shapes, and f is an average focal length.
15. An optical system according to claim 10 , wherein the optical system satisfies any one of the following conditions:
|S|< ({fraction (1/30)})| f|
|S|< (⅕)| f|
|S|< ({fraction (1/50)})| f|
where S is an amount of shift of a ray position or an amount of shift of an image position on an imaging plane between two states where each of the deformable mirrors takes the two different shapes, and f is an average focal length.
16. An optical apparatus comprising:
the optical system according to claim 15 .
17. An optical apparatus comprising:
the optical system according to claim 10 ;
an image sensor; and
a display device.
18. An optical system comprising an optical element whose surface profile is changeable, the optical element comprising:
a variable member that is deformable to take at least two different shapes; and
a control system that controls the variable member,
wherein the at least two different shares are achieved by a change of at least one of zeroth-order and first-order terms of an equation expressing a surface of the optical element.
19. An optical apparatus comprising:
the optical system according to claim 18 ,
an image sensor; and
a display device.
20. An optical system according to claim 18 , satisfying any one of the following conditions:
| S |<({fraction (1/30)})| f|
| S |<(⅕)| f|
| S |<({fraction (1/50)})| f|
where S is an amount of shift of a ray position or an amount of shift of an image position on an imaging plane between two states where the deformable mirror takes the two different shapes, and f is an average focal length.
21. A variable magnification optical system comprising:
the optical system according to claim 18 .
22. A variable magnification optical system according to claim 21 , satisfying any one the following conditions:
| S |<({fraction (1/30)})| f|
| S |<(⅕)| f|
| S |<({fraction (1/50)})| f|
where S is an amount of shift of a ray position or an amount of shift of an image position on an imaging plane between two states where the deformable mirror takes the two different shapes, and f is an average focal length.
23. An optical system according to claim 18 , used in a shake compensating optical system.
24. An optical system according to claim 23 , satisfying any one of the following conditions:
| S |<({fraction (1/30)})| f|
| S |<(⅕)| f|
| S |<({fraction (1/50)})| f|
where S is an amount of shift of a ray position or an amount of shift of an image position on an imaging plane between two states where the deformable mirror takes the two different shapes, and f is an average focal length.
25. An optical apparatus satisfying any one of the following conditions:
| S |<({fraction (1/30)})| f|
| S |<(⅕)| f|
| S |<({fraction (1/50)})| f|
where S is an amount of shift of a ray position or an amount of shift of an image position on an imaging plane between two states where a deformable mirror takes two different shapes, and f is an average focal length.Cited by (0)
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